/*
 * Middleware
 * Copyright (C) 2010/11
 * Riccardo Pulvirenti, Giuseppe Ravidà, Andrea Tino
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANDABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses
 */

/*!
 * File: performance_index.hpp
 */

#ifndef _PERFORMANCE_INDEX_HPP_
#define _PERFORMANCE_INDEX_HPP_

//-----------------------------------------------------------------------------
// Enum, struct, aliases
namespace middleware {
namespace calculus {
/*!
 * Parameters needed for calculating PI.
 */
typedef struct {
	double eval_cpu_mhz; /* CPU MHz */
	double eval_ram_mb; /* RAM in MegaBytes */
	unsigned int eval_core_num; /* Number of cores per processor */
	unsigned int eval_cpu_num; /* Number of processors */
	unsigned int eval_hops; /* INET hop distance */
	double eval_bandwidth; /* Bandwidth in KBit/s */
	unsigned int eval_load; /* Number of tasks in queue in worker */
} PerformanceEvalParams;
/*!
 * PI type.
 */
typedef double PIType;
}
}
//-----------------------------------------------------------------------------
// Constants
namespace middleware {
namespace calculus {
const double kPerformanceEvalBeta = 3.0;
const double kPerformanceEvalDelta = 1.0;
const double kPerformanceEvalG = 1.60;
const double kPerformanceEvalH = 1.014;
const double kPerformanceEvalR = 512;
}
}
//-----------------------------------------------------------------------------
// Functions declarations
namespace middleware {
namespace calculus {
/*!
 * Used to calculate log in a given base.
 */
double Log(double base, double arg);
/*!
 * Used to calculate sqrt.
 */
double Sqrt(double arg);
/*!
 * Used to calculate exp by a given base.
 */
double Exp(double base, double arg);
/*!
 * Used for calculate PI
 */
PIType CalculatePI(const PerformanceEvalParams& pep);
}
}

#endif
